refine the git interface to handle no git and old git #4684
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It may be that the installed git is too old for the cesm git interface or that
git is missing on a system (for example not available on compute nodes). This PR makes the git interface conditional on git being present and above a minimum version
Test suite:scripts_regression_tests
Test baseline:
Test namelist changes:
Test status: bit for bit
Fixes [CIME Github issue #]
User interface changes?:
Update gh-pages html (Y/N)?: